I just spent the wekeend detailing a pretty neglected black car, and tried a bunch of new products on it - I know you're doing the detail tomorrow, so I'm not sure if this'll help but...
I tried the Einszett Paint Polish (green can) and was absolutely floored by it. It is my new favorite product for "prep work - " it's absolutely amazing, there's no other word for it.
We first tried hitting the black car with 3M PI-III Machine Glaze and found that it was nearly impossible to remove; alcohol/water removed it, but I hate that routine...Switched to FI-II, didn't touch the swirls. Tried DACP, was similar to the PI-III Machine Glaze.
Reluctantly (because I'd never used it before), I reached for the the Einszett Paint Polish, grabbed a yellow pad and started buffing - AMAZING!!
The stuff stays wet as long as you're working it, and then it flashes and hazes nearly immediately after you stop. Wiped off with total ease and left a great looking finish. I washed a little section of the hood with alcohol/water and then dawn/water to see if it had fillers, and it looks like it doesn't. The black was looking really, really good.
edit: After playing with it a bit more, I think it may have some fillers; it apparently gives protection which is fairly durable, which led to a possibly false impression that there were no fillers. YMMV
/edit
I followed it up with the Metallic Polish (red can) and then compared the MP to GEPC; GEPC looked just a *wee bit* better, so I used GEPC on the rest of the car.
We then did a quickie wash and proceeded to Z5/ZFX the car, and all I can say is "wow." No more swirls - just a gorgeous, deep & reflective finish. Owner was extremely pleased.
Anyway, sorry for the
, but I just had to share my experience with the Einszett Paint Polish - absolutely amazing stuff, so far.